Shaft milling and grinding machine



'Aug. 10, 1943.

o. 0.. PREMO 2,326,391

SHAFT MILLING AND GRINDING MACHINE Filed NM? 13, 1940 4 Sheets-Sheet lINVENTOR.

ATTbRNEYS.

Aug. 10, 1943; o. D. PREMO 2,326,391

SHAFT MILLING AND GRINDING MACHINE Filed Nov. 13, 1940 4 Sheets-Sheet 2m 0werz/J.Pfiem0 IN VEN TOR.

A TTORNEYS.

Aug. 10, 1943. o. D. PREMO SHAFT MILLING AND GRINDING MACHINE Filed NOV.15, 19450 4 Sheets-Sheet 3 JNVEN TOR.

Aug. 10, 1943. o, PREMQ 2,326,391

SHAFT MILLING AND GRINDING MACHINE Filed Nov. 15, 1940 4 Sheets-Sheet 4i 291 i I i '1 l. i 0

39 4 4/ Barrens a 34 INVENTOR.

ATTORNEYS.

Patented Aug. 10, 1943 UNITED STATES PATENT OFFICE SHAFT MILLING ANDGRinnrNo insomnia.

7 Owen D. Fremmjlv iuskegon Heights Mich. Application November 13, 940,Serial No. 3653 2. Ca s.

This invention relates to shaft milling and grinding machines, theprimary object. of the invention being to provide a machine of this 7the cutter to rotate in a direction to equalize the cutting forces; 7

Still another object of the invention is to-provide a machine whichmaybe used in accurately forming molding from metal or wooden bar stock.

With the foregoing and other object in view, which will appear as thedescription proceeds, the invention resides'in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the. preciseembodiment of the invention herein described, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawings:

Figure 1 is a .plan view of a machine con structed in accordance withthe invention. I

Figure 2 is a side elevational View thereof.

Figure 3 is a longitudinal sectional view through the machine.

Figure 4 is a modified form of the invention illustrating the principlesof the invention as carried out in a pencil sharpening device.

Figure 5 is a sectional View taken on line 55 of Figure 4.

Referring to the drawings in detail, the base of the machine isindicated by the reference character 5, the base being supported bybolting the base to the lathe, traveling head or machine with which theattachment is used, as by means of bolts 6.

The body portion of the machine comprises substantially circular membersI whichare hollow and have their open sides disposed outwardly, asclearly shown by Figure 1 of the drawings. Openings 8 are formed in themembers 1, and

der treatment, may passv from the circular meme bersf 1. Tubularshafts 9operate in openings formed at thefinner. ends of the circular mom-ibersl, the tubula'rshafts 9 providing bearings for. the bar undertreatment, which in the present showing is, indicated at'A.. Keyed tothe 1111-; bular shafts 9 are. plates Iii which are disk-like. information, the-plates being, boltedto the gear H as by means of boltslZ' whichpass through the. plates [0. and gear. The. gear 11' is formedwith. a central opening, so that the bar maybe passed through the.machine and through the gear. The circular members 7, are formedwithrecessed portions. in which the ring gears i3 are mounted. Keyed. to theouter ends of the tubue lar shafts 9. are arms 14 which have openingsformed adjacent to. the outer ends. thereof, which openings receive the.tubular bearings E5 to which the cutters ifiIare. secured, the cutterslfi havin openings to receive theinner ends of the tubularbearings,where the tubular bearings are selcuried to the cutters, by means of thescrews I1... Extending into. the. tubular bearings lii are shafts [8.that. have reducedend on which. the gears H) are mounted, the gears t9meshing with the ring gears 13. The gears I9 are secured to the shaftsl8 to rotate therewith.

As shown, the inner ends of the shafts 'IB are tubular and are formedwith slots extend bearings l5, the coiled springs being normally provideclearances 50 that material such as chips,

grindings or the like removed from the bar ununder tension, to urge thecutters It towards their work, and to compensate for material removedfrom the work by the cutters.

The inner ends of the tubular shafts 9 are keyed to the plates It, sothat rotary movement of the gear II, will produce a relative rotarymovement of the tubular shafts s towrotate the arms 14. Power is appliedto the gear I I, through" the worm 22 ,mounted on'one end of the powershaft 23, that in turn is rotated by the motor 24. Thus it will be seenthat due to this construction, the bar or work under treatment, will beengaged by the cutters It, operating at; opposite sides of the work, anddue to the rapid rota-- tion of the cutters, the bar moving through themachine, will be ground or milled accurately and evenly.

The shafts l8, are disposed in openings formed in the hollow supports 25that are provided with bearings 26 extended into bearing openings formedin the covers 21 that are used to guard the cutters. These covers 21 arebolted to the circular members I, by means of the bolts 28.

In the form of the invention as illustrated by Figure 4 of the drawings,the principle of the invention has been used in tapering the ends ofbars or the like, and in the present showing, the cutters are used in apencil sharpener. The reference character 29 designates 'the'hollow baseof the sharpener, in which the motor-30 is mounted. The body portion ofthe sharpener is indicated by the reference character 3| and as shown,is provided with a threaded annular flange 32 fitted within the upperend of the hol low base 29. The body portion 3| is formed with willcause the cutters 36 to rotate, to accomplish the tapering result.

What is claimed is:

1. A shaft milling machine comprising a base, a body portion mounted onthe base and comprising hollow members, aligned hollow shafts extendinginto the hollow members, pairs of arms having bearings, secured to theinner ends of said hollow shafts and operating within the a centralopening providing a bearing for the vertical shaft 33 that extends intothe hollow base 29 to connect with the motor shaft. At the upper end ofthe shaft 33, are arms 34 that have openings disposed adjacent to thefree ends thereof, for the reception of the'hollow shafts 35, whichshafts are identical inconstruction with the members -l5.' The cuttersare indicated by the reference36 and have their opposed inclinedsurfaces so arranged that they will engage opposite sides of the worktotaper or sharpen "the endthereof. Extending into the hollow shafts 35,are shafts Sl'thateXtend through the movable casing 33 and are suppliedwith gears 39 at their outer ends, the gears 39 meshing with the ringgear 40 held stationary within the body portion 3|.

Coiled springs Mare mounted within the 1101- I low shaft 35 and bearagainst the shaft 31, nor

mally urging the cutters 36 towards eachother, to insure the cuttingfaces thereof being held to their work to compensate for materialremoved from the work. It will be seen that as the shaft 33 is rotated,the member 38 together with the shafts 3'! will be rotated in horizontalplanes. As the members 38 rotate, the gears 39 will rota'te by reason oftheir contact with the ring gear). This rotary movement of the gears '39hollow members, a gear secured to the adjacent 'ends of the hollowshafts between the hollow members, ring gears secured within the hollowmembers, shafts mounted in the bearings of the pairs of arms, pinions onthe outer ends of the latter shafts, said pinions being in mesh with thea ring gears, milling tools mounted on the inner ends of the lattershafts, said milling tools extending into the tool support-Said armshaving bearings at their free ends, hollow tool shafts extending throughthe bearings, grinding tools on the inner ends of the tool shafts,shafts extending into the tool shafts, the pinions on the latter shaftsmeshing with the ring gears, coiled springs mounted within the hollowtool shafts and bearing against the inner ends of the shafts extendinginto 'the tool shafts, and adapted to normally urge the tools inwardlytowards the shaft being milled, said hollow body portion having openingsin the ends thereof through which a shaft to be milled is moved, andmeans for rotating' said tools around the shaft being milled.

,V-OWEN D. PREMO.

